In the summer, your horse is often bothered by flies and other insects. The fine-mesh material of the BR fly rugs protects your horse against biting insects. By taking a rug with neck cover, your horse is protected all over his body. If you also use a fly mask, the insects cannot cause irritation on the head and the eyes of your horse. By attaching the mask to the neck cover, the insects don't get a chance to bite your horse. Look for the masks in the category fly fringes and masks.
If you are going to ride somewhere and there are a lot of insects around, such as in the forest, use an exercise-fly rug so that your horse can enjoy the ride as well. BR even has fly rugs with a neck cover and a saddle opening so that the neck is also protected.
Some fly rugs have a black / white print, because research with zebras has shown that this has a disorienting effect on flies and mosquitoes, so they prefer to stay away from them. Nice and quiet for your horse.